While it is simplest to say that William Shakespeare of Stratford wrote the plays that bear his name, there are many arguments, ranging from curiously intriguing to outrageous, to suggest that he might not have.

Rogues, Vagabonds, and Sturdy Beggars:
The Shakespeare Authorship Question for Beginners
An excellent, non-partisan place to dive in

The Shakespeare Authorship Roundtable
Another good non-partisan site

The Shakespeare Question
A gathering of the evidence by a Princeton librarian:
As thorough and reliable as you'd expect, given the source

The Shakespeare Authorship Coalition
A“Dedicated to legitimizing the Shakespeare Authorship issue”

"Brief History of the Authorship Question"
From the Shakespeare Fellowship (Oxfordian)-
A useful chronological summary of doubts

The Shakespeare Authorship Page
"Dedicated to the Proposition that Shakespeare Wrote Shakespeare"
An aggressive defense with much useful material

"The Case for Shakespeare"
By Irving Matus, Atlantic Monthly (Oct. 1991)

"To Be or Not To Be Shakespeare?"
By Doug Stewart, Smithsonian magazine (Sept. 2006)
Graceful, succinct coverage of the infighting

Frontline: The Shakespeare Mystery
Documentary first broadcast by PBS in 1989

Shakespeare Authorship Studies Conference
An annual conference, generally Anti-Stratfordian

Recommended Reading:
Who Wrote Shakespeare? by John Michell (London: Thames & Hudson, 1996)

Lost Plays	Manuscripts	Authorship Controvesy	Alternate Candidates	Delia and the Doubters	Occult Shakespeare	The Sonnets	Shakespearean Places	The Howards	Recommended Reading